That is not a marketing line. It is the architecture, and it decides what these tools can and cannot do.
There are no accounts to create. Nothing you write is sent anywhere I can read. When a product says it does not collect your data, you usually have to take that on faith — here you can check it, because there is no endpoint to send anything to.
The cost is real too: no cloud sync, no cross-device history, no analytics telling me which features you use. I decided that trade was worth it.
Two products · one in review
What I've built
The annoyance
The sentence that mattered while reading is gone once you close the tab.
Highlighter
A Chrome extension that highlights sentences in place and lets you attach a note right there. Come back later and everything is restored where you left it. Stored on your device by default; sync is off until you turn it on.
On a busy day you can go from morning to night without smiling once.
SmileDay
An iPhone app that reminds you a few times a day, gives you five seconds, and records only how many times you did it. No photos, no scoring, no streaks.
Korean interface only for now. It is on the App Store worldwide, but everything inside is in Korean. An English version is not ready, so I'd rather you knew before installing.